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# mode: python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4
# -*- vim:fenc=utf-8:ft=python:et:sw=4:ts=4:sts=4
# Copyright (c) 2008-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
# Copyright (c) 2014 Jakob Normark <jakobnormark@gmail.com>
# Copyright (c) 2014 Brett Cannon <brett@python.org>
# Copyright (c) 2014 Manuel Vázquez Acosta <mva.led@gmail.com>
# Copyright (c) 2014 Derek Harland <derek.harland@finq.co.nz>
# Copyright (c) 2014 Arun Persaud <arun@nubati.net>
# Copyright (c) 2015-2017 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2015 Mihai Balint <balint.mihai@gmail.com>
# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
# Copyright (c) 2017 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2017 Daniela Plascencia <daplascen@gmail.com>
# Copyright (c) 2018 Sushobhit <31987769+sushobhit27@users.noreply.github.com>
# Copyright (c) 2018 Ryan McGuire <ryan@enigmacurry.com>
# Copyright (c) 2018 thernstig <30827238+thernstig@users.noreply.github.com>
# Copyright (c) 2018 Radostin Stoyanov <rst0git@users.noreply.github.com>
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
"""Emacs and Flymake compatible Pylint.
This script is for integration with emacs and is compatible with flymake mode.
epylint walks out of python packages before invoking pylint. This avoids
reporting import errors that occur when a module within a package uses the
absolute import path to get another module within this package.
For example:
- Suppose a package is structured as
a/__init__.py
a/b/x.py
a/c/y.py
- Then if y.py imports x as "from a.b import x" the following produces pylint
errors
cd a/c; pylint y.py
- The following obviously doesn't
pylint a/c/y.py
- As this script will be invoked by emacs within the directory of the file
we are checking we need to go out of it to avoid these false positives.
You may also use py_run to run pylint with desired options and get back (or not)
its output.
"""
import os
import os.path as osp
import shlex
import sys
from io import StringIO
from subprocess import PIPE, Popen
def _get_env():
"""Extracts the environment PYTHONPATH and appends the current sys.path to
those."""
env = dict(os.environ)
env["PYTHONPATH"] = os.pathsep.join(sys.path)
return env
def lint(filename, options=()):
"""Pylint the given file.
When run from emacs we will be in the directory of a file, and passed its
filename. If this file is part of a package and is trying to import other
modules from within its own package or another package rooted in a directory
below it, pylint will classify it as a failed import.
To get around this, we traverse down the directory tree to find the root of
the package this module is in. We then invoke pylint from this directory.
Finally, we must correct the filenames in the output generated by pylint so
Emacs doesn't become confused (it will expect just the original filename,
while pylint may extend it with extra directories if we've traversed down
the tree)
"""
# traverse downwards until we are out of a python package
full_path = osp.abspath(filename)
parent_path = osp.dirname(full_path)
child_path = osp.basename(full_path)
while parent_path != "/" and osp.exists(osp.join(parent_path, "__init__.py")):
child_path = osp.join(osp.basename(parent_path), child_path)
parent_path = osp.dirname(parent_path)
# Start pylint
# Ensure we use the python and pylint associated with the running epylint
run_cmd = "import sys; from pylint.lint import Run; Run(sys.argv[1:])"
cmd = (
[sys.executable, "-c", run_cmd]
+ [
"--msg-template",
"{path}:{line}: {category} ({msg_id}, {symbol}, {obj}) {msg}",
"-r",
"n",
child_path,
]
+ list(options)
)
process = Popen(
cmd, stdout=PIPE, cwd=parent_path, env=_get_env(), universal_newlines=True
)
for line in process.stdout:
# remove pylintrc warning
if line.startswith("No config file found"):
continue
# modify the file name thats output to reverse the path traversal we made
parts = line.split(":")
if parts and parts[0] == child_path:
line = ":".join([filename] + parts[1:])
print(line, end=" ")
process.wait()
return process.returncode
def py_run(command_options="", return_std=False, stdout=None, stderr=None):
"""Run pylint from python
``command_options`` is a string containing ``pylint`` command line options;
``return_std`` (boolean) indicates return of created standard output
and error (see below);
``stdout`` and ``stderr`` are 'file-like' objects in which standard output
could be written.
Calling agent is responsible for stdout/err management (creation, close).
Default standard output and error are those from sys,
or standalone ones (``subprocess.PIPE``) are used
if they are not set and ``return_std``.
If ``return_std`` is set to ``True``, this function returns a 2-uple
containing standard output and error related to created process,
as follows: ``(stdout, stderr)``.
To silently run Pylint on a module, and get its standard output and error:
>>> (pylint_stdout, pylint_stderr) = py_run( 'module_name.py', True)
"""
# Detect if we use Python as executable or not, else default to `python`
executable = sys.executable if "python" in sys.executable else "python"
# Create command line to call pylint
epylint_part = [executable, "-c", "from pylint import epylint;epylint.Run()"]
options = shlex.split(command_options, posix=not sys.platform.startswith("win"))
cli = epylint_part + options
# Providing standard output and/or error if not set
if stdout is None:
if return_std:
stdout = PIPE
else:
stdout = sys.stdout
if stderr is None:
if return_std:
stderr = PIPE
else:
stderr = sys.stderr
# Call pylint in a subprocess
process = Popen(
cli,
shell=False,
stdout=stdout,
stderr=stderr,
env=_get_env(),
universal_newlines=True,
)
proc_stdout, proc_stderr = process.communicate()
# Return standard output and error
if return_std:
return StringIO(proc_stdout), StringIO(proc_stderr)
return None
def Run():
if len(sys.argv) == 1:
print("Usage: %s <filename> [options]" % sys.argv[0])
sys.exit(1)
elif not osp.exists(sys.argv[1]):
print("%s does not exist" % sys.argv[1])
sys.exit(1)
else:
sys.exit(lint(sys.argv[1], sys.argv[2:]))
if __name__ == "__main__":
Run()
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